IBENZO{8 b,e{9 {0 THIEPINES

ABSTRACT

Disclosed are dibenzo (b,e) -oxepin and dibenzo (b,e) thiepin11-one useful as intermediates for the preparation of corresponding 11-aminoalkylated derivatives which have pharmaceutical activity.

' United States Patent Charles L. Zlrkle Benvyn, Pa.

Apr. 2, 1962 Sept. 28. 1971 Smith Kline & French Laboratories Philadelphia, Pa.

Inventor Appl. No. Filed Patented Assignee IBENZO [b,e] THIEPINES 3 Clalma, No Drawing;

Int-Cl. C07d 67/00 Field 01 Search 260/327.

Relerencea Cited UNITED STATES PATENTS 2,676,971 4/ 1954 Cusic et a1. 260/328 3,047,580 7/1962 Sprague 260/268 3,113,137 12/1963 Schaeren etal. .6 260/327 3.116.291 12/1963 Petersen et a1. 260/240 FOREIGN PATENTS 607,503 2/1962 Belgium 260/327 OTHER REFERENCES Stach et a1. Angew, Chem. lntemat. Ed.. Vol. 1 (1-27-62). page: 50- l. I

Primary Examiner-James A. Patten Amman-William H. Edgerton. Richard D. Fuggio and Joan S. Keps Disclosed are dihenzolbgkoxe in and dibenzo [b.elthmpm-ll-onqusefui as |ntenned|ates or the preparanon of comespondmg l 1-gm|noalkylated derivatives which have pharmaceutical. activity.

IBENZO[b,e] THIEPINES CO Br NaS CH -S This invention relates to novel dibenzo[b.e]-oxepinand {3 cos I dibenzo[b,e]thiepin-l l-ones. These novel compounds are useful as intermediates for the preparation of corresponding 5 ll-aminoalkylated derivatives which are useful as tranquil- CH -B izers, antidepressants. antlemettcs. antihistamines. potenttators and generally effect the central nervous system. The l preparation of these i l-aminoalkylated derivatives from the novel compounds of this invention is described more fully l l com hereinbelow.

The novel dibenzo[b.e]oxepinand dibenzo[b.e]-thiepinll-ones of this invention are represented by the following general structural formula:

0 CHI-Y FORMULA 1 u Thus. Z-carboxybenzyl bromide [C.A 471325511] is reacted 1 with thiophenol. in a solvent such as acetone and in the presence of an alkali metal carbonate. such as potassium carbonate. to give Z-carboxybenzyl phenyl sulfide [U.S. Pat. No.

2.862.956; Example 31. Cyclodehydration or this Sulfide with when Y represents oxygen or sulfur. an acidic reagent such as a mineral acid. for example In the structure f Formula I. the benzenotd rings y be polyphosphoric acid or the like at from 90 to 120 C yields substituted with a halogen such as chlorine or bromine. alkyl. the dibenzo[b.elthiepin-l l-one. alkoxy. alkylthio or trifluoromethyl group and when Y is sul- Both the 2-carboxybenzyl phenyl ether and sulfide as shown u d u r a m y bc Oxidiud ulfoxidc above in the synthetic schemes are particularly useful as interfonc. mediates for the preparation of dibenzolixe I-oxcpinand The b l t l P are P i y thi epin-l l ones since the isomeric 2-carboxyphcnyl bcnzyl following ynlhelic ether and sulfide gave little or no cyclized product.

ll-Aminoalkylated dibenzo[b.e]oxepins and dibenzol h.e It

H 81- are represented by the following general structural formulas:

--0 C 0 Br NaO CHr-Q I CH -Y cu -Y c (EH ncncm-z cmcHcNr-z I RI FORMULA ll FORMULA III This, a-bromoo-toluoyl bromide J. Chem. see. t2, 2201 (l922)]is reacted with phenol using the Schotten-Baumann technique to give the phenyl ester. The ester is converted to hiepins useful as tranquilizers. antidepressants. antiemetics. antihistamines, potentiators and central nervous system cf fc tors are readily prepared from the derivatives of Formula I and the either by refluxing with phenol. n 1101"!!! su l3 whereYis oxygen or sulfurrR, is'hydrogen or methyliand? is n n the pr n o an alkali metal a e. such a amino. monoloweralkylamino. diloweralkylamino (the alkyl potassium carbonate. and copper-bronze catalyshl'lydrolysis moieties having fromone to six carbon atoms) or a monowith an alkali metal hydroxide. S c "S hy xid n cyclic heterocyclic amino moiety containing from four to II f r example aqueous ethanol gives the Z-carboxybenzyl phencarbon atoms. and containing a maximum of two hetero ring yl ether (US. Pat- N 2. p l ind which is members selected from the groupof oxygen. nitrogen and sul then cyclodehydrated with an acidic reagent such as a mineral fur. such as pyrrolldino. morpholino, thiamorphulinn.

acid. for example polyphosphorlc acid. sulfuric acid or piperidino or N-substituted-N-piperazino. for. example N'- hydrofluoric acid. or a polyphosphoric acid ester such as that methyl. hydroxyethyl, acetoxyethyl or hydroxye'thoxyethyl-N- prepared from phosphorus p'entoxide in ethanol. to give the piperazino. Also, the benzenoid rings may be substituted with V dibenzo[b.eloxepin-l l-one. g a halogen such as chlorine or bromine. alkyl. alkoxy. alkylthio The dibenzo[b,e]thiepin-l l-onesare prepared as shown by or trifluoromethyl group and when Y is sulfur. said sulfur atom the following illustrative synthetic scheme: I may be oxidized to the sulfoxide or sulfone. The term aminoal ltyl is used generically herein to include all amino, monoloweralkylamino. diloweralltylamino and heterocyclic aminoalltyl moieties as set forth in Formulas ll and 111, unless otherwise specified. v

Thus, the dibcnzo{b,e]oxepinand dibenzo[b,e]-thiepin-ll -ones of Formula l are reacted with a diloweralltylaminoalkyl ur hctcrocyclic aminoalkyl magnesium halide in an inert organic solvent such as ether, dioxane or preferably tctrahydrofuran. The reaction is carried out at a temperature of from about 30 C. to 100 C. for a period of from about 30 minutes to 4 hours. Removal of the solvent and treatment of the residue with water or ammonium chloride solution separates the useful intermediates, the ll-hydroxy-l laminoalkybdibenzolb,e1oxepins and -dibenzo[b,e]thiepins.

These 1 l-hydroxy derivatives are dehydrated by treatment with a mineral acid such as hydrochloric or sulfuric acid at about 60 C. to 100 C. for a period of about 1 to 5 hours. Removal of the excess acid gives the useful products. 11- aminoalklyidene-dibenzolb,e]oxepins and -dibenzo[b,e]t hiepins as represented by Formula 11.

The piperazinyl derivatives of Formula 11 having a free terminal nitrogen atom are prepared by employing as described above an N-benzylpiperazinylalkyl magnesium'halide to give the corresponding ll-hydroxy derivative. The benzyl protective group is removed by hydrogenolysis and then the 11- hydroxy derivative with a free terminal nitrogen atom on the piperazinyl moiety is dehydrated to the alltylidene compound.

- Further alkylation of the N-piperazinyl derivative thus obtained with an alkylene oxide, alltylene halohydrin or hydroxyalkoxy-loweralkyl halide yields other N'-substituted piperazinylfcompounds of Formula ll. Acetylation of the N-hydroxyalkylN-piperazinyl compounds thus formed with for example acetyl chloride yields the corresponding N'-(u-acetoxyalkyl)-n-piperazinyl derivatives of Formulall.

Certain of the ll-aminoallrylidene derivatives represented by Fonnula 11 above are advantageously prepared by reacting the dlbenmibfilolcpin and dibenzo[b,e]thiepin-1l-ones of Formula 1 with a methoxyalltyl magnesium'halide as described above to give the intermediate ll-methoxyallryl-l l-hydroxydibenzo[b,e]oxepins and -dibenzo[b,e]thiepins. These useful intermediates are treated with concentrated (48 percent) hydrobromic acid to give simultaneous dehydration'of the 1 1- hydroxy group aNd cleavage of the methyl either linkage. The resulting ll-bromoalkylidene intermediates are treated with ammonium, a monoloweralltylamine, diloweralltylaminmpyrrolidine, piperidine or N-loweralkyl-piperazine to give the corresponding amino substituted products of Formula 11.

The ll-aminoalkylidene derivatives of Formula 11, in addition to having the utility described above, are useful as intermediates to prepare the ll-aminoalltyl compounds as represented by Formula 111. Thus, the alkylidene compounds are reduced by hydrogenation in the presence of a hydrogenation catalyst, such as platinum oxide or palladium-on-eharcoal to give the alkyl'derivatives.

The alkylidene compounds of Formula 11 may be present as eis or trans isomers as well as mixtures of these isomers. The isomers are separated by fractional crystallization of their acid addition salts from a suitable solvent or mixture of solvents such as for example, acetone-ether or ethanol-ether. In addition, certain compounds of Formulas I1 and ill, in which R, is methyl, may be present as optical isomers. The connotation of the general formulas presented herein to include all isomers, the separated d or 1 optical isomers as well as the di mixture and the separated cis or trans isomers as well as the mixture of these isomers;

The following examples illustrate the preparation of the compounds of this invention and further provide exemplary preparations of l l-aminoallrylated derivatives thereof.

' EXAMPLE l concentrated hydrochloric acid. An oil which solidifies on standing is recrystallized from benzene-petroleum ether to give 2-carboxybenzyl phenyl sulfide, m.p. l06'-108' C.

A mixture of 150 ml. of percent phosphoric acid and 240 g. of phosphorus pentoxide is heated to 115 C. To this mixture with vigorous stirring is added 32.5 g. of 2Carb0xybcnzyl phenyl sulfide. The mixture is maintained at l05l l5 C. for three-fourths of an hour and then poured into 1.5 l. of cold water. An initial oil soon solidifies and is extracted with either. The extract is washed with l0 percent sodium hydroxide solution and then water. The dried extract is decolorized and conccntrated to give a solid. Recrystallization from ethanol gives dibenzo [b,e]thiepin-l l-one, m.p. 83-84C.

EXAMPLEZC of a-bromo-mtoluoyl bromide at room temperature. The reaction mixture is stirred an additional 15 minutes and extracted with ether. The extract -is washed with 10 percent sodium hydroxide solution and then water. The dried extract is concentrated under reduced pressure and the residue distilled to given phenyl abromo-o-toluate, b.p. l$5-l57 C.l0.l mm., m.p. 4145 C.

A mixture of 19.2 g. of phenyl a-bromo-o-toluate, 6.8 g. of phenol, 9.1 g. of anyhydrous potassium carbonate, 250 ml. of acetone aNd 0.7 g. of copper-bronze is stirred and heated to reflux. The reaction mixture is refluxed for 24 hours, diluted with water, filtered and the filtrate extracted with ether. The extract is washed with 10 percent sodium hydroxide solution and then water. The died extract is concentrated to give Z-carboxybenzyl phenyl ether, phenyl ester, m.p. 81 .5'-83 C.

A mixture of 11.0 g. of the above phenyl ester, 11.0 g. of sodium hydroxide, 99 g. of ethanol and 11 ml. of water is refluxed for l 55 hours. The mixture is poured into 1.0 l. of cold water and acidified with concentrated hydrochloric acid to yield a precipitate of Z-carboxybenzyl phenyl ether, m.p. l21-124' C.

To 28.4 g. of phosphorus pentoxide is added 23.0 g. of ethanol with vigorous stirring and then 11.4 g. of Z-carboxybenzyl phenyl ether. The mixture is refluxed for about 30 minutes, poured into 500 ml. of cold water and then extracted with ether. The extract is washed with 10 percent sodium hydroxide solution and then water. The dried extract is concentrated to give dibenzo [b.eloxepin-l l-one.

EXAMPLE 3 initiating the reaction with ethyl bromide. After refluxing under nitrogen with stirring for 1 hour, a solution of 6.0 g. of dibenzo [b,e]thlepin-l l-one in 50 ml. of tetrahydrofuran is added and the mixture refluxed for 2'6 hours. The solvent is removed in vacuo and the residue poured into an ice-water, ammonium chloride solution to give ll-hydroxy-l l-(3- dimethylaminopropyhdibenzolb,e]thiepin, m.p. l32.5-l33.5 C.

The hydroxy compound (2.1 g.) is dehydrated by heating for 3 hours with 200 ml. of concentrated hydrochloric acid on the steam bath. Removal of the acid in vacuo gives 11-(3- diemthylaminopropylidene)dibenzo[b,e]-thiepin hydrochloride, m.p. 2l0'-213 C.

The free base is obtained by making a solution of the hydrochloride salt basic and extracting with ether.

EXAMPLE 4 To the Grignard reagent formed from 9.6 g. of 3- dimethylaminopropyl chloride and 2.0 g. of magnesium in tetrahydrofuran is added a solution of 1L2 g. of dibenzdlb;

oxepin-l l-one in 100 ml. of tetrahydrofuran and .themixture refluxed for 3 hours. The solvent is removed in vacuo and the residue poured into ice-water, ammonium chloride solution to give 1 l-hydroxy-l l-( 3-dimethylaminopropyl)dibenzol b.e]oxepin.

The hydroxy compound (5.0 g.) is dehydrated by heating for 3 hours with 50 ml. of concentrated hydrochloric acid on the steam bath. Removal of the acid in vacuo gives ll-(3- dimethylaminopropylidene)dibenzolbgl-oxepin hydrochloride from which is obtained the free base.

EXAMPLE 5 What is claimed is: V

l. A compound of the formula:

wherein Z is a member selected from the group consisting of monoloweralkylamino and diloweralkylamino.

2. l l-( 3-Dimethylaminopropyl )dibenzoI lthiepin.

3. The compound of the formula:

OHI- 1 @Q /C 11 \CHIOHICHIN\ mg UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION September 28, 1971 Patent No. 3 09 1 7 Dated Inventor(s) Charles L Zirkle It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 6, line 11, should read,

ll-(3-Dimethylaminopropyl)dibenzo[b,e]

2. thiepin.

Column 6, lines 15-20, the structural formula should be,

HO CH CH CH N Signed and sealed this 6th day of February 1973.

(SEAL) Attest:

ROBERT GOTTSCHALK EDWARD M.FLETCHER,JR. Attesting Officer Commissioner of Patents 

2. 11-(3-Dimethylaminopropyl)dibenzo( b,e)thiepin.
 3. The compound of the formula: 